Electrical Response Type Frequency Meter

Many are instruments of the deflection type ordinarily used for measuring low frequencies but capable of being used for frequencies as high as 900 hz.

Electrical response type frequency meter.

Weston m i type frequency meter principle. Analog electronic energy meters in analog type meters voltage and current values of each phase are obtained by voltage divider and current transformers respectively which are directly connected to the load as shown in figure. The electrical resonance type frequency meter is an indicating type instrument. Absorption frequency or wave meter various types of frequency meters are used.

A frequency meter is an instrument that displays the frequency of a periodic electrical signal. The frequency of input signal is the displayed count averaged over a suitable counting interval out of 0 1 1 0 or 10 seconds. It is then converted to frequency or pulse rate. Construction of electrical resonance type frequency meter.

It mainly consists of a fixed coil and a moving coil. These three intervals repeat themselves sequentially. 4 6 out of 5 stars 1 098. Two common types of frequency meters are the vibrating reed frequency meter and the moving disk frequency meter.

The reed type meter is useful only at low frequencies and only over a limited range of frequencies. Another type of frequency meter is the digital frequency meter which measures frequency up to about 100 mhz and displays a digital readout of the measured frequency as shown in figure 2. Vibrating reed frequency meter the vibrating reed frequency meter is one of the simplest devices for indicating the frequency of an ac source. As the name suggests its action depends upon the electrical resonance.

Construction of weston frequency is as compared to ferrodynamic type of frequency meter. The main principle of working of weston type frequency meter is that when an current flows through the two coils which are perpendicular to each other due to these currents some magnetic fields will produce and thus the magnetic needle will deflects towards the stronger magnetic field showing the measurement of frequency on the meter. The vibrating reed frequency meter is a very simple instrument and has got an advantage of giving reading free from errors due to change in temperature waveform and magnitude of applied voltage. The vibrating reed type frequency meters or mechanical resonance type frequency meter indicate the supply frequency of the circuit directly and are very much convenient for most practical purposes.

A frequency meter has a small device which converts the sinusoidal voltage of the frequency into a train of unidirectional pulses. There is a laminated iron core of varying cross section.